A few days ago one of FSwizard:PRo users questioned me over how FSwizard works.

The way SFM calculates seemed off to him.

As a result i made a quick sketch for him, that i thought i would share here.

Omar was asking me how come SFM seemed wrong for a 1" dia ball-nose cutter when making shallow depth cuts.

The sketch above shows exactly why.

On the left part we see a cutter engaged into the material to the depth equal to its corner radius.
At that depth the maximum effective diameter is achieved. So an old good RPM=4xSFM/Dia formula would apply.

But at shallower depths, effective diameter of the cutter is reduced.

At 0.1" depth of cut, effective diameter would only be around 0.6"

In fact it goes to zero at the very centre. So a higher RPM will be required to achieve the recommended cutting speed.

In the same thread i also explained how DOC/WOC balancing works.

So if you are interested - read on.

Here is the thread http://zero-divide.net/index.php?page=forums&shell_id=170&article_id=4590

Have just released another update to FSWizard for mobile devices.

Version 1.26 available now for Android and in a week for iOS adds Countersink/ Drillpoint Calculator.
It allwos to enter tool diameter, Tip angle, and a diameter of countersink reqiured.
It outputs Depth required to achive such diameter.

Also Thread size dropdown list was fixed.
It was showing wrong thread sizes when calculator was loaded with thread form other than UNC.

In other news i have spent a whole day trying to upload updated FSWizard to the iTunes appstore.

Every time i make an update for iOS i dread that very thing.
Every time i have to spend anywhere from several hour to several DAYS trying to upload an already finished app.
Sometimes i have to restart my computer, sometimes clean the project , sometimes i need to dance around singing voodoo songs....

Apple, YOU take 30% of my profit, I pay YOU 100$ a year just for the privelege of designing apps for your devices.
Can YOU please make the damn thing work THE first time i try it?

Drillpoint wizard

After almost 2 months since the last release the next update has just been uploaded to the google Play Store.

Version 1.32 follows in the footsteps of the HSMAdvisor.

It now too has latest material definitions and an updated custom material drop-down list.

This list now expands to the size of the screen overriding default Samsung's scroller (that they stole from iPhone).

Biggest update yet is a new Tap and Form Tap tool types.
You can now get not only cutting speed and feedrate for taps, but also calculate the best drill size for desired thread percentage.

New material list Tap Tap hole parameters